Question

The reaction that differs from the rest of the reaction given is- (a) formation of calcium oxide from limestone (b) formation of aluminium from aluminium oxide (c) formation of sodium carbonate from sodium hydrogen carbonate (d) formation of mercury from mercuric oxide​

Answer 1

Answer:

B)formation of aluminium from aluminium oxide

This is a redox reaction and all others are decomposition..

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Answer 2

Final answer: Option (b) Formation of aluminium from aluminium oxide is different from the rest of the given reactions.

Given that: We are given the reactions:

(a) formation of calcium oxide from limestone

(b) formation of aluminium from aluminium oxide

(c) formation of sodium carbonate from sodium hydrogen carbonate

(d) formation of mercury from mercuric oxide​

To find: We have to find the reaction that differs from the rest of the given reactions.

Explanation:

• (a) Formation of calcium oxide from limestone is a decomposition reaction.

The reaction:

        $CaCO_{3}$ → $CaO + CO_{2}$

• (b) Formation of aluminium from aluminium oxide is a redox reaction.

The reaction:

       $Al_{2} O_{3}$  →  $3 Al + \frac{3}{2} O_{2}$

• (c) Formation of sodium carbonate from sodium hydrogen carbonate is again a decomposition reaction.

The reaction:

        $2NaHCO_{3}$ → $Na_{2}CO_{2} + CO_{2} + H_{2}O$

• (d) Formation of mercury from mercuric oxide is also a decomposition reaction.

The reaction:

        $2HgO$→ $2Hg + O_{2}$

• Among the given reactions option (a), option(c) and option (d) are decomposition reaction and option (b) is redox reaction.

Decomposition reaction is the chemical reaction in which the reactant breaks down into two or more products, while a redox reaction is a chemical reaction where the electrons are transferred between the reactants.

• So option (b) Formation of aluminium from aluminium oxide is different from the rest of the given reactions.

To know more about the concept please go through the links

https://brainly.in/question/9854479

https://brainly.in/question/2747616

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